【Safe for Dogs】Our dog bark collar will automatically stop working if your dog continuously barks for over 30s, preventing any negative effect to the dog. Carefree for dog owners. 【Adjustable Sensitivity】With 7 sensitivity levels, you can adjust it to the level that works on your dog most. The combination of warning beep and static shock trains your dog effectively and harmlessly. 【USB Rechargeable】This no bark collar has a built-in battery, rechargeable through a USB cable and can be used for 10 to 14 days after being fully charged. No more worries about battery replacement. 【Smart-Detection Chip】This anti bark collar adopts the latest sound-detecting technology, which accurately distinguishes the dog's barking from other noises. It won’t be triggered by other dog's barking. 【Suitable for all sizes dogs】Adjustable bark collar for dogs. The diameter of collar belt can be stretched from 1.08 inches to 7.08 inches, which is designed for all 15 to 100 lb, from mini, small, medium to large dogs.